Ericsson, John, 1803-1889 · New York : Printed for the author at "The Nation" Press · leaf 305
ADIANT HEAT. CHAP. XVII. settle tbe question by some reliable, practical test. I haveaccortlingly constructed the apparatus illustrated ou Plate28, by means of wliicli the relative conducting j)ower of acolunm of copper and one of mercury has been ascertainedwith ciitical nicety. Before entering on… … of the sun during the observation influences the accuracy ofthe indication. This will be readily comprehended. Fig. 2represents the bulb of a thermometer exposed to the raysAvhen the suns zenith distance is 65 deg.; Fig. 3 Iepresentingthe bulb when the zenith distance is 18 deg. 23 min., thelatter…
